// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
#include <linux/rtnetlink.h>
#include <sys/types.h>
#include <net/if.h>
#include "test_progs.h"
#include "network_helpers.h"
#include "fib_lookup.skel.h"
#define NS_TEST "fib_lookup_ns"
#define IPV6_IFACE_ADDR "face::face"
#define IPV6_IFACE_ADDR_SEC "cafe::cafe"
#define IPV6_ADDR_DST "face::3"
#define IPV6_NUD_FAILED_ADDR "face::1"
#define IPV6_NUD_STALE_ADDR "face::2"
#define IPV4_IFACE_ADDR "10.0.0.254"
#define IPV4_IFACE_ADDR_SEC "10.1.0.254"
#define IPV4_ADDR_DST "10.2.0.254"
#define IPV4_NUD_FAILED_ADDR "10.0.0.1"
#define IPV4_NUD_STALE_ADDR "10.0.0.2"
#define IPV4_TBID_ADDR "172.0.0.254"
#define IPV4_TBID_NET "172.0.0.0"
#define IPV4_TBID_DST "172.0.0.2"
#define IPV6_TBID_ADDR "fd00::FFFF"
#define IPV6_TBID_NET "fd00::"
#define IPV6_TBID_DST "fd00::2"
#define MARK_NO_POLICY 33
#define MARK 42
#define MARK_TABLE "200"
#define IPV4_REMOTE_DST "1.2.3.4"
#define IPV4_LOCAL "10.4.0.3"
#define IPV4_GW1 "10.4.0.1"
#define IPV4_GW2 "10.4.0.2"
#define IPV6_REMOTE_DST "be:ef::b0:10"
#define IPV6_LOCAL "fd01::3"
#define IPV6_GW1 "fd01::1"
#define IPV6_GW2 "fd01::2"
#define DMAC "11:11:11:11:11:11"
#define DMAC_INIT { 0x11, 0x11, 0x11, 0x11, 0x11, 0x11, }
#define DMAC2 "01:01:01:01:01:01"
#define DMAC_INIT2 { 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, }
struct fib_lookup_test {
const char *desc;
const char *daddr;
int expected_ret;
const char *expected_src;
const char *expected_dst;
int lookup_flags;
__u32 tbid;
__u8 dmac[6];
__u32 mark;
};
static const struct fib_lookup_test tests[] = {
{ .desc = "IPv6 failed neigh",
.daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_NO_NEIGH, },
{ .desc = "IPv6 stale neigh",
.daddr = IPV6_NUD_STALE_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.dmac = DMAC_INIT, },
{ .desc = "IPv6 skip neigh",
.daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv4 failed neigh",
.daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_NO_NEIGH, },
{ .desc = "IPv4 stale neigh",
.daddr = IPV4_NUD_STALE_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.dmac = DMAC_INIT, },
{ .desc = "IPv4 skip neigh",
.daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv4 TBID lookup failure",
.daddr = IPV4_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_NOT_FWDED,
.lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID,
.tbid = RT_TABLE_MAIN, },
{ .desc = "IPv4 TBID lookup success",
.daddr = IPV4_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID, .tbid = 100,
.dmac = DMAC_INIT2, },
{ .desc = "IPv6 TBID lookup failure",
.daddr = IPV6_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_NOT_FWDED,
.lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID,
.tbid = RT_TABLE_MAIN, },
{ .desc = "IPv6 TBID lookup success",
.daddr = IPV6_TBID_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.lookup_flags = BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_TBID, .tbid = 100,
.dmac = DMAC_INIT2, },
{ .desc = "IPv4 set src addr from netdev",
.daddr = IPV4_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_src = IPV4_IFACE_ADDR,
.lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv6 set src addr from netdev",
.daddr = IPV6_NUD_FAILED_ADDR, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_src = IPV6_IFACE_ADDR,
.lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv4 set prefsrc addr from route",
.daddr = IPV4_ADDR_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_src = IPV4_IFACE_ADDR_SEC,
.lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv6 set prefsrc addr route",
.daddr = IPV6_ADDR_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_src = IPV6_IFACE_ADDR_SEC,
.lookup_flags = BPF_FIB_LOOKUP_SRC | BPF_FIB_LOOKUP_SKIP_NEIGH, },
/* policy routing */
{ .desc = "IPv4 policy routing, default",
.daddr = IPV4_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_dst = IPV4_GW1,
.lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv4 policy routing, mark doesn't point to a policy",
.daddr = IPV4_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_dst = IPV4_GW1,
.lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH,
.mark = MARK_NO_POLICY, },
{ .desc = "IPv4 policy routing, mark points to a policy",
.daddr = IPV4_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_dst = IPV4_GW2,
.lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH,
.mark = MARK, },
{ .desc = "IPv4 policy routing, mark points to a policy, but no flag",
.daddr = IPV4_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_dst = IPV4_GW1,
.lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH,
.mark = MARK, },
{ .desc = "IPv6 policy routing, default",
.daddr = IPV6_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_dst = IPV6_GW1,
.lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH, },
{ .desc = "IPv6 policy routing, mark doesn't point to a policy",
.daddr = IPV6_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_dst = IPV6_GW1,
.lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH,
.mark = MARK_NO_POLICY, },
{ .desc = "IPv6 policy routing, mark points to a policy",
.daddr = IPV6_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_dst = IPV6_GW2,
.lookup_flags = BPF_FIB_LOOKUP_MARK | BPF_FIB_LOOKUP_SKIP_NEIGH,
.mark = MARK, },
{ .desc = "IPv6 policy routing, mark points to a policy, but no flag",
.daddr = IPV6_REMOTE_DST, .expected_ret = BPF_FIB_LKUP_RET_SUCCESS,
.expected_dst = IPV6_GW1,
.lookup_flags = BPF_FIB_LOOKUP_SKIP_NEIGH,
.mark = MARK, },
};
static int setup_netns(void)
{
int err;
SYS(fail, "ip link add veth1 type veth peer name veth2");
SYS(fail, "ip link set dev veth1 up");
SYS(fail, "ip link set dev veth2 up");
err = write_sysctl("/proc/sys/net/ipv4/neigh/veth1/gc_stale_time", "900");
if (!ASSERT_OK(err, "write_sysctl(net.ipv4.neigh.veth1.gc_stale_time)"))
goto fail;
err = write_sysctl("/proc/sys/net/ipv6/neigh/veth1/gc_stale_time", "900");
if (!ASSERT_OK(err, "write_sysctl(net.ipv6.neigh.veth1.gc_stale_time)"))
goto fail;
SYS(fail, "ip addr add %s/64 dev veth1 nodad", IPV6_IFACE_ADDR);
SYS(fail, "ip neigh add %s dev veth1 nud failed", IPV6_NUD_FAILED_ADDR);
SYS(fail, "ip neigh add %s dev veth1 lladdr %s nud stale", IPV6_NUD_STALE_ADDR, DMAC);
SYS(fail, "ip addr add %s/24 dev veth1", IPV4_IFACE_ADDR);
SYS(fail, "ip neigh add %s dev veth1 nud failed", IPV4_NUD_FAILED_ADDR);
SYS(fail, "ip neigh add %s dev veth1 lladdr %s nud stale", IPV4_NUD_STALE_ADDR, DMAC);
/* Setup for prefsrc IP addr selection */
SYS(fail, "ip addr add %s/24 dev veth1", IPV4_IFACE_ADDR_SEC);
SYS(fail, "ip route add %s/32 dev veth1 src %s", IPV4_ADDR_DST, IPV4_IFACE_ADDR_SEC);
SYS(fail, "ip addr add %s/64 dev veth1 nodad", IPV6_IFACE_ADDR_SEC);
SYS(fail, "ip route add %s/128 dev veth1 src %s", IPV6_ADDR_DST, IPV6_IFACE_ADDR_SEC);
/* Setup for tbid lookup tests */
SYS(fail, "ip addr add %s/24 dev veth2", IPV4_TBID_ADDR);
SYS(fail, "ip route del %s/24 dev veth2", IPV4_TBID_NET);
SYS(fail, "ip route add table 100 %s/24 dev veth2", IPV4_TBID_NET);
SYS(fail, "ip neigh add %s dev veth2 lladdr %s nud stale", IPV4_TBID_DST, DMAC2);
SYS(fail, "ip addr add %s/64 dev veth2", IPV6_TBID_ADDR);
SYS(fail, "ip -6 route del %s/64 dev veth2", IPV6_TBID_NET);
SYS(fail, "ip -6 route add table 100 %s/64 dev veth2", IPV6_TBID_NET);
SYS(fail, "ip neigh add %s dev veth2 lladdr %s nud stale", IPV6_TBID_DST, DMAC2);
err = write_sysctl("/proc/sys/net/ipv4/conf/veth1/forwarding", "1");
if (!ASSERT_OK(err, "write_sysctl(net.ipv4.conf.veth1.forwarding)"))
goto fail;
err = write_sysctl("/proc/sys/net/ipv6/conf/veth1/forwarding", "1");
if (!ASSERT_OK(err, "write_sysctl(net.ipv6.conf.veth1.forwarding)"))
goto fail;
/* Setup for policy routing tests */
SYS(fail, "ip addr add %s/24 dev veth1", IPV4_LOCAL);
SYS(fail, "ip addr add %s/64 dev veth1 nodad", IPV6_LOCAL);
SYS(fail, "ip route add %s/32 via %s", IPV4_REMOTE_DST, IPV4_GW1);
SYS(fail, "ip route add %s/32 via %s table %s", IPV4_REMOTE_DST, IPV4_GW2, MARK_TABLE);
SYS(fail, "ip -6 route add %s/128 via %s", IPV6_REMOTE_DST, IPV6_GW1);
SYS(fail, "ip -6 route add %s/128 via %s table %s", IPV6_REMOTE_DST, IPV6_GW2, MARK_TABLE);
SYS(fail, "ip rule add prio 2 fwmark %d lookup %s", MARK, MARK_TABLE);
SYS(fail, "ip -6 rule add prio 2 fwmark %d lookup %s", MARK, MARK_TABLE);
return 0;
fail:
return -1;
}
static int set_lookup_params(struct bpf_fib_lookup *params,
const struct fib_lookup_test *test,
int ifindex)
{
int ret;
memset(params, 0, sizeof(*params));
params->l4_protocol = IPPROTO_TCP;
params->ifindex = ifindex;
params->tbid = test->tbid;
params->mark = test->mark;
if (inet_pton(AF_INET6, test->daddr, params->ipv6_dst) == 1) {
params->family = AF_INET6;
if (!(test->lookup_flags & BPF_FIB_LOOKUP_SRC)) {
ret = inet_pton(AF_INET6, IPV6_IFACE_ADDR, params->ipv6_src);
if (!ASSERT_EQ(ret, 1, "inet_pton(IPV6_IFACE_ADDR)"))
return -1;
}
return 0;
}
ret = inet_pton(AF_INET, test->daddr, ¶ms->ipv4_dst);
if (!ASSERT_EQ(ret, 1, "convert IP[46] address"))
return -1;
params->family = AF_INET;
if (!(test->lookup_flags & BPF_FIB_LOOKUP_SRC)) {
ret = inet_pton(AF_INET, IPV4_IFACE_ADDR, ¶ms->ipv4_src);
if (!ASSERT_EQ(ret, 1, "inet_pton(IPV4_IFACE_ADDR)"))
return -1;
}
return 0;
}
static void mac_str(char *b, const __u8 *mac)
{
sprintf(b, "%02X:%02X:%02X:%02X:%02X:%02X",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
}
static void assert_ip_address(int family, void *addr, const char *expected_str)
{
char str[INET6_ADDRSTRLEN];
u8 expected_addr[16];
int addr_len = 0;
int ret;
switch (family) {
case AF_INET6:
ret = inet_pton(AF_INET6, expected_str, expected_addr);
ASSERT_EQ(ret, 1, "inet_pton(AF_INET6, expected_str)");
addr_len = 16;
break;
case AF_INET:
ret = inet_pton(AF_INET, expected_str, expected_addr);
ASSERT_EQ(ret, 1, "inet_pton(AF_INET, expected_str)");
addr_len = 4;
break;
default:
PRINT_FAIL("invalid address family: %d", family);
break;
}
if (memcmp(addr, expected_addr, addr_len)) {
inet_ntop(family, addr, str, sizeof(str));
PRINT_FAIL("expected %s actual %s ", expected_str, str);
}
}
static void assert_src_ip(struct bpf_fib_lookup *params, const char *expected)
{
assert_ip_address(params->family, params->ipv6_src, expected);
}
static void assert_dst_ip(struct bpf_fib_lookup *params, const char *expected)
{
assert_ip_address(params->family, params->ipv6_dst, expected);
}
void test_fib_lookup(void)
{
struct bpf_fib_lookup *fib_params;
struct nstoken *nstoken = NULL;
struct __sk_buff skb = { };
struct fib_lookup *skel;
int prog_fd, err, ret, i;
/* The test does not use the skb->data, so
* use pkt_v6 for both v6 and v4 test.
*/
LIBBPF_OPTS(bpf_test_run_opts, run_opts,
.data_in = &pkt_v6,
.data_size_in = sizeof(pkt_v6),
.ctx_in = &skb,
.ctx_size_in = sizeof(skb),
);
skel = fib_lookup__open_and_load();
if (!ASSERT_OK_PTR(skel, "skel open_and_load"))
return;
prog_fd = bpf_program__fd(skel->progs.fib_lookup);
SYS(fail, "ip netns add %s", NS_TEST);
nstoken = open_netns(NS_TEST);
if (!ASSERT_OK_PTR(nstoken, "open_netns"))
goto fail;
if (setup_netns())
goto fail;
skb.ifindex = if_nametoindex("veth1");
if (!ASSERT_NEQ(skb.ifindex, 0, "if_nametoindex(veth1)"))
goto fail;
fib_params = &skel->bss->fib_params;
for (i = 0; i < ARRAY_SIZE(tests); i++) {
printf("Testing %s ", tests[i].desc);
if (set_lookup_params(fib_params, &tests[i], skb.ifindex))
continue;
skel->bss->fib_lookup_ret = -1;
skel->bss->lookup_flags = tests[i].lookup_flags;
err = bpf_prog_test_run_opts(prog_fd, &run_opts);
if (!ASSERT_OK(err, "bpf_prog_test_run_opts"))
continue;
ASSERT_EQ(skel->bss->fib_lookup_ret, tests[i].expected_ret,
"fib_lookup_ret");
if (tests[i].expected_src)
assert_src_ip(fib_params, tests[i].expected_src);
if (tests[i].expected_dst)
assert_dst_ip(fib_params, tests[i].expected_dst);
ret = memcmp(tests[i].dmac, fib_params->dmac, sizeof(tests[i].dmac));
if (!ASSERT_EQ(ret, 0, "dmac not match")) {
char expected[18], actual[18];
mac_str(expected, tests[i].dmac);
mac_str(actual, fib_params->dmac);
printf("dmac expected %s actual %s ", expected, actual);
}
// ensure tbid is zero'd out after fib lookup.
if (tests[i].lookup_flags & BPF_FIB_LOOKUP_DIRECT) {
if (!ASSERT_EQ(skel->bss->fib_params.tbid, 0,
"expected fib_params.tbid to be zero"))
goto fail;
}
}
fail:
if (nstoken)
close_netns(nstoken);
SYS_NOFAIL("ip netns del " NS_TEST);
fib_lookup__destroy(skel);
}
Codebase Browser
linux